Method of forming boxes or box parts with curved bottoms



June 7, 1932. SCHWEDEL 1,862,390

METHOD OF FORMING BOXES OR BOX PARTS WITH CURVED BOTTOMS Filed Feb. 8,1930 l rw Fig.2

Patented June 7, 1932 PATENT FFE JOHANNES SCI-IMIEDEL, 0F DRESDEN,GERMANYASSIGNOR TO THE FIRM UNIVER- SELLE CIGARETTENMASCHINEN FABRIK J.G. 'lVITl'LLER & 00., 0F DBESCDEN, GER- MANY METHOD OF FORMING- BOXES ORBOX PARTS WITH GURVED BOTTOMS Application fi1ed February 8, 1930, SerialNo.

This invention relates to the production of boxes with arched or shapedbottoms.

In the production of boxes, particularly boxes provided with lids andprovided with a neck insert it is usual to arch the lid or give it aconcave form and also to provide it with impressions.

It has been proposed to form the boxes first with a fiat base and a flatlid, to open them after completion and in this position to deliver themto a stamping press which sub sequently produces the convexity of thelid and the necessary impressions. This known method has thedisadvantage that it involves changing the shape of the alreadycompleted box an operation which with fragile articles does not afford asatisfactory product.

It has moreover, been proposed to curve the portion of the blank whichwill be the bottom before producing the box and to apply the blank soshaped to the finished lower part and to form it.

Great difiiculties arise under this method because the shaping of thelid on the neck insert is only possible naturally if the lid is of thinpaper and the neck insert of strong cardboard.

The present method consists in shaping the box blank with the aid of aforming block curved on the corresponding side wall in a' shapingchannel first with a flat bottom surface and then shaping the blankembracing the forming block in the shaping channel or in a passagearound the curved portion of the forming block by means of a shaped diepassing through the corresponding opening in the Wall of the channel. Inapparatus for carrying the method into effect there is arranged in thefeed channel which serves to receive the forming block provided with thefolded work, a shaped die moving transversely of the longitudinaldirection of the channel which presses the work as it comes in front ofit over the curved portion of the forming block.

426,887, and in Germany February 26, 1929.

The invention is illustrated in the accompanying drawings in which Fig.1 is a vertical longitudinal section through the apparatus, Fig. 2 is avertical cross section on the line 22 of Fig. 1, while Fig. 3illustrates in. perspective a forming block suitable for the purpose.

Referring to the drawings, the neck strip Za disposed above the junctionof the two blanks Z0 and Zu is pushed into the shaping channel 2 alongwith the blanks by means of a forming block F pushed downwards by theplunger 1. The plunger 3 which is retracted as the plunger 1 advancesserves as an abutment. While the blanks are bent upwards at right angleson the upper edges of the shaping channel 2, the sides are pressedagainst the forming block by the folding bars 2. After the plunger 8 hasreturned to the position shown in dotted lines in Fig. 1 the plunger 4moves forward and pushes the forming block with the work thereon intothe channel 5. As a result the two ends of the neck strip which stillproject are pressed against the forming block by the bending,

fingers 6 on the plunger 4 and the stationary bending finger 7 arrangedin front of the channel 5.

The bars 8 arranged at the forward end of the channel 5 press the stillprojecting upper side edges of the blank against the forming block.

The curved die 9 now passes through an opening in the wall of thechannel 5 and presses the bottom of the work over the curved portion ofthe forming block. It should be noted that in positioning the blanksbetween the forming block E and the plunger 3 in the shaping channel agap must be left at the junction of the two side edges. This is easilyprovided by means of stops which detain the blank Zu somewhat. At theend of the channel 5 the work is led by means of the plunger 10 into achannel 11 from which it is fed to known means for applying a bindingstrip or fastening the corners.

The movement of the various elements is effected as follows The plunger1 is supported on the extension 13 of the machine frame 13 in a "uide12. The movement of the plunger is effected as follows:-

A lever 14 is pivotally mounted at 15 to said extension 13 and by meansof forked arm 15 engages a projection 16 on the plunger shaft. The freeend of lever 15 is pivotally connected to a link 17 which latter ispivotally connected to one end of a lever 18. Lever 18 is pivotedintermediate its ends to the machine frame as at 19. The free end oflever 18 has a roller 20 thereon which tracks a cam 21 keyed to a shaft22 which latter has also a gear 23 thereon driven in a manner to bepresently described.

Folding member 6 which is slidably mounted on the die shaft 4 isactuated as follows. A link 42 is pivotally connected to member 6 and toone end of a lever 40. Lever 40 is pivotally connected to the machineframe at 41. The other end of lever 40 is pivotally connected to a link39 which is also pivotally connected to a lever 38. Lever 38 is pivotedto the machine frame at 29. Intermediate the ends lever 38 is providedwith a cam roller 37, which tracks a cam 36 k yed on a shaft 25. A gear24 on shaft 25 meshes with gear 23 for a purpose to be presentlydescribed.

Plunger 4 which is slidably supported in' a guide 35 is actuated asfollows A link 34 is pivotally connected to the plunger and to one endof a lever 31. Lever 31 is pivotally connected to the machine frame at32. The free end of lever 31 is pivotally connected to a link 30 whichis pivotally connected to a lever 28. Lever 28 is pivoted to the machineframe at 29. Intermediate its ends said lever is provided with a roller27 which tracks a cam 26 also keyed to shaft 25.

Plunger 3 which is slidably supported in a guide 51 is actuated asfollows A lever 48 pivoted at 49 to the machine frame, with its end 48engages a projection 50 on plunger 3. A link 47 is pivotally connectedto lever 48 intermediate the ends of the latter. Said link also ispivotally connected to a lever 45 which latter is pivotally mounted tothe machine frame at 46. Intermediate its ends lever 45 is provided witha roller 44 which tracks a cam 43 also keyed on shaft 25. A spring 52fastened at 53 to the machine frame and to the plunger 3 on an extension3 thereof tends to maintain the plunger in raised position at all times.

Plunger 10 is slidably supported in a guide 64 mounted on an extension13 of said frame 13. Said plunger is actuated as follows A lever 61 ispivotally mounted at 62 to extension 13". One end of said lever isforked at 61 and engages a projection 63 on plunger 10. A link ispivotally connected to the other end of lever 61 and to one end of alever 58. The latter is pivoted to the machine frame at 59. Intermediateits ends, lever 58 is provided with a cam roller 57 which tracks a cam56 keyed to a shaft 55. Also keyed to shaft 55 is a gear 54 which mesheswith gear 24. A bevel gear 65 is also keyed to shaft 55 and may meshwith a suitably supported bevel gear 65 on a shaft 66. A second bevelgear 67 keyed to shaft 66 meshes with a gear 67 on the main drive shaft68 to which a suitable power source (not shown) may be connected. Sincegears 23, 24 and 54 mesh, all the cams are driven from a common source.

In Fig. 2 of the annexed sketches is shown the holding and feeding meansfor the box blanks Z0 and Zn and the actuating means of die 9.

Holders 82 and 88 respectively are mounted on the machine frame 13 andthe blanks Z0 and Zn are respectively fed from the piles therein by thefeeders 81 and 87. The feeders are actuated as follows A link 80 ispivotally connected to feeder 81 and to one end of a lever 7 8 which ispivoted at 7 9 to the frame 13. The free end of lever 78 is providedwith a roller 7'7 which tracks a cam 76 rotatably borne on a shaft 70. Alink 86 is pivotally connected to the feeder 87 and one end of a lever84. The latter is pivotally connected to the frame 13 at 85. A link 83is pivotally connected to the free end of lever 84 and also pivotallyconnected to lever 78 at 83. Movement of lever 78 therefore serves toactuate both feeders 81 and 87.

Die 9 which is supported in a guide 94 is actuated as follows:

A link 93 is pivotally connected to said die and one end of a lever 91.The latter is pivoted at 92 to frame 13 and at its free end has a roller90 which tracks a cam 89. The latter is keyed to shaft 70. Shaft throughsuitable gearing is driven from shaft 68.

I claim 1. Apparatus for forming boxes or box parts with curved bottomsincluding a forming block said forming block formed with a curvedportion, a feed channel serving to receive the forming block providedwith the folded box, said feed channel formed with an opening, and ashaped die movable transversely of the longitudinal direction of thechannel and adapted to press the box around the said curved portion ofthe forming block.

2. A method of forming a box having a curved face from two box blankscomprising folding said blanks about a forming block having a curvedface to form a flat faced box and then curving the portion of the soformed box adjacent said curved face of said block to conform to theshape thereof while on said block.

3. A method of forming a box part having a curved face from a box blankincluding the step of folding said blank about a forming block having acurved face to form a fiat faced box and then curving the portion of theso formed box adjacent the curved face of said block to conform to theshape thereof While on said block.

In testimony whereof I aflix my signature.

J OHANNES SCHMIEDEL.

